| ad-lib(adjective, simple, natural, casual, impulsive) |
| automatic(adjective, simple, natural, casual, impulsive) |
| break loose(expression, adjective, simple, natural, casual) |
| casual(adjective, simple, natural, impulsive, willing) |
| down(adjective, simple, natural, casual, impulsive) |
| extemporaneous(adjective, simple, natural, casual, impulsive) |
| extempore(adjective, simple, natural, casual, impulsive) |
| free(adjective, simple, natural, casual, impulsive) |
| free spirited(expression, adjective, simple, natural, casual) |
| from the hip(expression, adjective, idiom, simple, natural) |
| impetuous(adjective, simple, natural, casual, impulsive) |
| impromptu(adjective, simple, natural, casual, impulsive) |
| improvised(adjective, simple, natural, casual, impulsive) |
| impulsive(adjective, simple, natural, casual, willing) |
| inevitable(adjective, simple, natural, casual, impulsive) |
| instinctive(adjective, simple, natural, casual, impulsive) |
| involuntary(adjective, simple, natural, casual, impulsive) |
| irresistible(adjective, simple, natural, casual, impulsive) |
| natural(adjective, simple, casual, impulsive, willing) |
| off-the-cuff(adjective, simple, natural, casual, impulsive) |